LCOV - code coverage report
Current view: top level - gcc/go - go-backend.c (source / functions) Hit Total Coverage
Test: gcc.info Lines: 45 52 86.5 %
Date: 2020-03-28 11:57:23 Functions: 5 5 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /* go-backend.c -- Go frontend interface to gcc backend.
       2                 :            :    Copyright (C) 2010-2020 Free Software Foundation, Inc.
       3                 :            : 
       4                 :            : This file is part of GCC.
       5                 :            : 
       6                 :            : GCC is free software; you can redistribute it and/or modify it under
       7                 :            : the terms of the GNU General Public License as published by the Free
       8                 :            : Software Foundation; either version 3, or (at your option) any later
       9                 :            : version.
      10                 :            : 
      11                 :            : GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      12                 :            : WARRANTY; without even the implied warranty of MERCHANTABILITY or
      13                 :            : FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      14                 :            : for more details.
      15                 :            : 
      16                 :            : You should have received a copy of the GNU General Public License
      17                 :            : along with GCC; see the file COPYING3.  If not see
      18                 :            : <http://www.gnu.org/licenses/>.  */
      19                 :            : 
      20                 :            : #include "config.h"
      21                 :            : #include "system.h"
      22                 :            : #include "coretypes.h"
      23                 :            : #include "target.h"
      24                 :            : #include "tree.h"
      25                 :            : #include "memmodel.h"
      26                 :            : #include "tm_p.h"
      27                 :            : #include "diagnostic.h"
      28                 :            : #include "simple-object.h"
      29                 :            : #include "stor-layout.h"
      30                 :            : #include "intl.h"
      31                 :            : #include "output.h"   /* for assemble_string */
      32                 :            : #include "common/common-target.h"
      33                 :            : #include "go-c.h"
      34                 :            : 
      35                 :            : /* The segment name we pass to simple_object_start_read to find Go
      36                 :            :    export data.  */
      37                 :            : 
      38                 :            : #ifndef GO_EXPORT_SEGMENT_NAME
      39                 :            : #define GO_EXPORT_SEGMENT_NAME "__GNU_GO"
      40                 :            : #endif
      41                 :            : 
      42                 :            : /* The section name we use when reading and writing export data.  */
      43                 :            : 
      44                 :            : #ifndef GO_EXPORT_SECTION_NAME
      45                 :            : #define GO_EXPORT_SECTION_NAME ".go_export"
      46                 :            : #endif
      47                 :            : 
      48                 :            : #ifndef TARGET_AIX
      49                 :            : #define TARGET_AIX 0
      50                 :            : #endif
      51                 :            : 
      52                 :            : /* This file holds all the cases where the Go frontend needs
      53                 :            :    information from gcc's backend.  */
      54                 :            : 
      55                 :            : /* Return whether or not GCC has reported any errors.  */
      56                 :            : 
      57                 :            : bool
      58                 :      72708 : saw_errors (void)
      59                 :            : {
      60                 :      72708 :   return errorcount != 0 || sorrycount != 0;
      61                 :            : }
      62                 :            : 
      63                 :            : /* Return the alignment in bytes of a struct field of type T.  */
      64                 :            : 
      65                 :            : unsigned int
      66                 :    1083290 : go_field_alignment (tree t)
      67                 :            : {
      68                 :    1083290 :   unsigned int v;
      69                 :            : 
      70                 :    1083290 :   v = TYPE_ALIGN (t);
      71                 :            : 
      72                 :            : #ifdef BIGGEST_FIELD_ALIGNMENT
      73                 :            :   if (v > BIGGEST_FIELD_ALIGNMENT)
      74                 :            :     v = BIGGEST_FIELD_ALIGNMENT;
      75                 :            : #endif
      76                 :            : 
      77                 :            : #ifdef ADJUST_FIELD_ALIGN
      78                 :    1083290 :   v = ADJUST_FIELD_ALIGN (NULL_TREE, t, v);
      79                 :            : #endif
      80                 :            : 
      81                 :    1083290 :   return v / BITS_PER_UNIT;
      82                 :            : }
      83                 :            : 
      84                 :            : /* This is called by the Go frontend proper if the unsafe package was
      85                 :            :    imported.  When that happens we cannot do type-based alias
      86                 :            :    analysis.  */
      87                 :            : 
      88                 :            : void
      89                 :        243 : go_imported_unsafe (void)
      90                 :            : {
      91                 :        243 :   flag_strict_aliasing = false;
      92                 :        243 :   TREE_OPTIMIZATION (optimization_default_node)->x_flag_strict_aliasing = false;
      93                 :            : 
      94                 :            :   /* Let the backend know that the options have changed.  */
      95                 :        243 :   targetm.override_options_after_change ();
      96                 :        243 : }
      97                 :            : 
      98                 :            : /* This is called by the Go frontend proper to add data to the
      99                 :            :    section containing Go export data.  */
     100                 :            : 
     101                 :            : void
     102                 :    5335370 : go_write_export_data (const char *bytes, unsigned int size)
     103                 :            : {
     104                 :    5335370 :   static section* sec;
     105                 :            : 
     106                 :    5335370 :   if (sec == NULL)
     107                 :            :     {
     108                 :       3114 :       gcc_assert (targetm_common.have_named_sections);
     109                 :       3114 :       sec = get_section (GO_EXPORT_SECTION_NAME,
     110                 :            :                          TARGET_AIX ? SECTION_EXCLUDE : SECTION_DEBUG,
     111                 :            :                          NULL);
     112                 :            :     }
     113                 :            : 
     114                 :    5335370 :   switch_to_section (sec);
     115                 :    5335370 :   assemble_string (bytes, size);
     116                 :    5335370 : }
     117                 :            : 
     118                 :            : /* The go_read_export_data function is called by the Go frontend
     119                 :            :    proper to read Go export data from an object file.  FD is a file
     120                 :            :    descriptor open for reading.  OFFSET is the offset within the file
     121                 :            :    where the object file starts; this will be 0 except when reading an
     122                 :            :    archive.  On success this returns NULL and sets *PBUF to a buffer
     123                 :            :    allocated using malloc, of size *PLEN, holding the export data.  If
     124                 :            :    the data is not found, this returns NULL and sets *PBUF to NULL and
     125                 :            :    *PLEN to 0.  If some error occurs, this returns an error message
     126                 :            :    and sets *PERR to an errno value or 0 if there is no relevant
     127                 :            :    errno.  */
     128                 :            : 
     129                 :            : const char *
     130                 :      19538 : go_read_export_data (int fd, off_t offset, char **pbuf, size_t *plen,
     131                 :            :                      int *perr)
     132                 :            : {
     133                 :      19538 :   simple_object_read *sobj;
     134                 :      19538 :   const char *errmsg;
     135                 :      19538 :   off_t sec_offset;
     136                 :      19538 :   off_t sec_length;
     137                 :      19538 :   int found;
     138                 :      19538 :   char *buf;
     139                 :      19538 :   ssize_t c;
     140                 :            : 
     141                 :      19538 :   *pbuf = NULL;
     142                 :      19538 :   *plen = 0;
     143                 :            : 
     144                 :      19538 :   sobj = simple_object_start_read (fd, offset, GO_EXPORT_SEGMENT_NAME,
     145                 :            :                                    &errmsg, perr);
     146                 :      19538 :   if (sobj == NULL)
     147                 :            :     {
     148                 :            :       /* If we get an error here, just pretend that we didn't find any
     149                 :            :          export data.  This is the right thing to do if the error is
     150                 :            :          that the file was not recognized as an object file.  This
     151                 :            :          will ignore file I/O errors, but it's not too big a deal
     152                 :            :          because we will wind up giving some other error later.  */
     153                 :            :       return NULL;
     154                 :            :     }
     155                 :            : 
     156                 :      18912 :   found = simple_object_find_section (sobj, GO_EXPORT_SECTION_NAME,
     157                 :            :                                       &sec_offset, &sec_length,
     158                 :            :                                       &errmsg, perr);
     159                 :      18912 :   simple_object_release_read (sobj);
     160                 :      18912 :   if (!found)
     161                 :        696 :     return errmsg;
     162                 :            : 
     163                 :      18216 :   if (lseek (fd, offset + sec_offset, SEEK_SET) < 0)
     164                 :            :     {
     165                 :          0 :       *perr = errno;
     166                 :          0 :       return _("lseek failed while reading export data");
     167                 :            :     }
     168                 :            : 
     169                 :      18216 :   buf = XNEWVEC (char, sec_length);
     170                 :      18216 :   if (buf == NULL)
     171                 :            :     {
     172                 :            :       *perr = errno;
     173                 :            :       return _("memory allocation failed while reading export data");
     174                 :            :     }
     175                 :            : 
     176                 :      18216 :   c = read (fd, buf, sec_length);
     177                 :      18216 :   if (c < 0)
     178                 :            :     {
     179                 :          0 :       *perr = errno;
     180                 :          0 :       free (buf);
     181                 :          0 :       return _("read failed while reading export data");
     182                 :            :     }
     183                 :            : 
     184                 :      18216 :   if (c < sec_length)
     185                 :            :     {
     186                 :          0 :       free (buf);
     187                 :          0 :       return _("short read while reading export data");
     188                 :            :     }
     189                 :            : 
     190                 :      18216 :   *pbuf = buf;
     191                 :      18216 :   *plen = sec_length;
     192                 :            : 
     193                 :      18216 :   return NULL;
     194                 :            : }

Generated by: LCOV version 1.0

LCOV profile is generated on x86_64 machine using following configure options: configure --disable-bootstrap --enable-coverage=opt --enable-languages=c,c++,fortran,go,jit,lto --enable-host-shared. GCC test suite is run with the built compiler.